Different!
Its nice that you incorporated 4 different ideas into one. I liked that since so many people are now submitting JUST a dress-up game or JUST a soundboard. Anyway, to make reviewing this easier, I'll review each segment individualy.
Cartman Mouth -- This part didn't really stand out much. It just kind of showed the many mouths of Cartman for no particular reason (except to print out or trace, I suppose). However, it does tie together nicely with the other parts. Not the cream of this flash;s crap, however not a bad addition either. 4/10
Dress Up Cartman -- Ahh, the classic dress-up game. This one had a great selection of items to use and was put together quite well. The addition of some background South Park music would have been a nice addition, but wasn't too necesary. Alone the dress-up game would have been enough to pass judgement, but as a collection its even more impressive. 7/10
Talking From Show -- Once again, another classic. The soundboard. Not too many sounds to choose from, but again with all the other things in the collection, the lack of voice overs is hardly a let-down. With a couple of exceptions, the sound quality was quite good and I liked the clips that you chose. Not a bad peice of work. 6/10
Body Parts Find -- Quite an original concept. A little bit easy though, because simply scrolling the mouse can reveal the pieces. Again, some background music would be nice, but its absence isn't a total loss. Not a bad idea, and fairly well put together. 5/10
Overall not a bad collection of Cartman-related ideas. In terms of improvements, I would only add some more audio clips into the soundboard and add background music to the areas mentioned above. Good luck!